Sorry, your browser is unable to play this video.
Please install Adobe Flash™ and try again.
Alternatively upgrade to a modern browser.

Detective chief inspector Matt Bonner says he wants to speak to 15-year-old Dawda Jallow in connection with the murder of teenager Dogan Ismail on Sunday. Police are urgently trying to trace the schoolboy from Peckham, south London. Ismail, 17, was stabbed on the Aylesbury estate in Walworth, south east London, after what was believed to be an altercation over a mobile phone